{"id":"CVE-2025-38126","summary":"net: stmmac: make sure that ptp_rate is not 0 before configuring timestamping","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: stmmac: make sure that ptp_rate is not 0 before configuring timestamping\n\nThe stmmac platform drivers that do not open-code the clk_ptp_rate value\nafter having retrieved the default one from the device-tree can end up\nwith 0 in clk_ptp_rate (as clk_get_rate can return 0). It will\neventually propagate up to PTP initialization when bringing up the\ninterface, leading to a divide by 0:\n\n Division by zero in kernel.\n CPU: 1 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12.30-00001-g48313bd5768a #22\n Hardware name: STM32 (Device Tree Support)\n Call trace:\n  unwind_backtrace from show_stack+0x18/0x1c\n  show_stack from dump_stack_lvl+0x6c/0x8c\n  dump_stack_lvl from Ldiv0_64+0x8/0x18\n  Ldiv0_64 from stmmac_init_tstamp_counter+0x190/0x1a4\n  stmmac_init_tstamp_counter from stmmac_hw_setup+0xc1c/0x111c\n  stmmac_hw_setup from __stmmac_open+0x18c/0x434\n  __stmmac_open from stmmac_open+0x3c/0xbc\n  stmmac_open from __dev_open+0xf4/0x1ac\n  __dev_open from __dev_change_flags+0x1cc/0x224\n  __dev_change_flags from dev_change_flags+0x24/0x60\n  dev_change_flags from ip_auto_config+0x2e8/0x11a0\n  ip_auto_config from do_one_initcall+0x84/0x33c\n  do_one_initcall from kernel_init_freeable+0x1b8/0x214\n  kernel_init_freeable from kernel_init+0x24/0x140\n  kernel_init from ret_from_fork+0x14/0x28\n Exception stack(0xe0815fb0 to 0xe0815ff8)\n\nPrevent this division by 0 by adding an explicit check and error log\nabout the actual issue. While at it, remove the same check from\nstmmac_ptp_register, which then becomes duplicate","modified":"2026-03-20T12:42:41.163427Z","published":"2025-07-03T08:35:31.812Z","related":["MGASA-2025-0218","MGASA-2025-0219","SUSE-SU-2025:02846-1","SUSE-SU-2025:02853-1","SUSE-SU-2025:02923-1","SUSE-SU-2025:02969-1","SUSE-SU-2025:02996-1","SUSE-SU-2025:02997-1","SUSE-SU-2025:03011-1","SUSE-SU-2025:03023-1","SUSE-SU-2025:20577-1","SUSE-SU-2025:20586-1","SUSE-SU-2025:20601-1","SUSE-SU-2025:20602-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38126.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/030ce919e114a111e83b7976ecb3597cefd33f26"},{"type":"WEB","url":"https://git.kernel.org/stable/c/32af9c289234990752281c805500dfe03c5b2b8f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/379cd990dfe752b38fcf46034698a9a150626c7a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b263088ee8ab14563817a8be3519af8e25225793"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bb033c6781ce1b0264c3993b767b4aa9021959c2"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38126.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-38126"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"19d857c9038e5c07db8f8cc02b5ad0cd0098714f"},{"fixed":"32af9c289234990752281c805500dfe03c5b2b8f"},{"fixed":"b263088ee8ab14563817a8be3519af8e25225793"},{"fixed":"bb033c6781ce1b0264c3993b767b4aa9021959c2"},{"fixed":"379cd990dfe752b38fcf46034698a9a150626c7a"},{"fixed":"030ce919e114a111e83b7976ecb3597cefd33f26"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-38126.json"}}],"schema_version":"1.7.5"}